The idea of a global flood is ludicrous on the most basic level.
The United Nations Environment Programme estimates there are 1.4 billion cubic kilometres (330 million mi3) of water available on Earth. Including underground sources.
The highest point on the surface of the Earth is Mount Everest in Nepal. 8,848 meters tall (29,028 feet)
The mean radius of the Earth (Core to sea level) is 6,372,797 meters. With Everest added to that, it comes out to 6,381,645 meters.
The total mass of the hydrosphere of the oceans is about 1.4 × 1021 kilograms, which is about 0.023% of the Earth's total mass.
The volume of the earth in-between the highest and lowest points on earth assuming that the ENTIRE surface is flooded WITH landmasses accounted for is 5x105
Avalible- 1.4 billion cubic kilometers
Needed (To cover the ENTIRE surface)- 5 quadrillion cubic kilometers
Missing- 4.9999986 quadrillion cubic kilometers.
We would need probably nine or ten orders of magnitude more water than we actually have avalible. Even if there were a couple billion cubic kilometers hiding under the surface of the Earth, we would even BEGIN to have enough.
To have that much water on Earth would disrupt the gravity of the Earth and SERIOUSLY mess with the tripple point of water which would result in the death of all life as we know it.
As you see, it it mathematically IMPOSSIBLE for the ENTIRE surface of the Earth to be covered with water.
My wonderful fiancee helped with the math part
If you doubt the math, PM Dysnomia, she'll lay it out.
